Sloughing of cap cells and carbon exudation from maize seedling roots in compacted sand
Sloughing of cap cells and carbon exudation from maize seedling roots in compacted sand
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DOI：
10.1046/j.1469-8137.2000.00595.x
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发表时间：
2000-03-01
期刊：
影响因子：
9.4
通讯作者：
Bengough, AG
中科院分区：
文献类型：
--
作者：
Iijima, M;Griffiths, B;Bengough, AG
根冠细胞的脱落和粘液的分泌是根际渗透压实土的重要因素。我们第一次量化了根冠细胞在研磨性生长介质中的脱落速度，这种介质被压实以产生对根生长的机械阻抗。压实使玉米(Zea Mays)根冠细胞坍塌成沙的数量增加，从1930 d(-1)增加到3220 d(-1)。这意味着每毫米根部脱落的细胞数量增加了12倍(从60个增加到700个)。我们估计，在压实沙中，整个帽面面积被分离的细胞覆盖，而在松散沙中，这一比例为约7%。这种由脱落的细胞和粘液组成的润滑层可能会降低对土壤渗透的摩擦阻力。根中碳沉积总量约为110mgg(-1)和d(-1)。坍塌的细胞占了很大的比例
Sloughing of root cap cells and exudation of mucilage plays an important role in the penetration of compacted soils by roots. For the first time we have quantified the rate of sloughing of root cap cells in an abrasive growth medium that was compacted to create mechanical impedance to root growth. The number of maize (Zea mays) root cap cells sloughed into sand increased as a result of compaction, from 1930 to 3220 d(-1) per primary root. This represented a 12-fold increase in the number of cells sloughed per mm root extension (from 60 to > 700). We estimated that the whole of the cap surface area mas covered with detached cells in compacted sand, compared with c. 7% of the surface area in loose sand. This lubricating layer of sloughed cells and mucilage probably decreases frictional resistance to soil penetration. The total carbon deposited by the root was estimated at c. 110 mu g g(-1) sand d(-1). Sloughed cells accounted far